67564909 has 2 divisors, whose sum is σ = 67564910. Its totient is φ = 67564908.

The previous prime is 67564879. The next prime is 67564927. The reversal of 67564909 is 90946576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62173225 + 5391684 = 7885^2 + 2322^2 .

It is a cyclic number.

It is not a de Polignac number, because 67564909 - 2⁷ = 67564781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67564979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33782454 + 33782455.

It is an arithmetic number, because the mean of its divisors is an integer number (33782455).

Almost surely, 2^67564909 is an apocalyptic number.

It is an amenable number.

67564909 is a deficient number, since it is larger than the sum of its proper divisors (1).

67564909 is an equidigital number, since it uses as much as digits as its factorization.

67564909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 67564909 is about 8219.7876493253. The cubic root of 67564909 is about 407.2931118874.

The spelling of 67564909 in words is "sixty-seven million, five hundred sixty-four thousand, nine hundred nine".